import java.math.BigInteger;
import java.util.Scanner;

/**
 * Created With IntelliJ IDEA
 * Description:牛客网:首页 > 试题广场 > 三角形
 * <a href="https://www.nowcoder.com/questionTerminal/c67a09062c0f4a5b964eef0945d3dd06">...</a>
 * User: DELL
 * Data: 2023-04-20
 * Time: 13:07
 */


public class  Main{
    public static void main(String args[]){
        Scanner scanner = new Scanner(System.in);
        while(scanner.hasNext()){
            BigInteger a = scanner.nextBigInteger();
            BigInteger b = scanner.nextBigInteger();
            BigInteger c = scanner.nextBigInteger();
            if((a.add(b)).compareTo(c) <= 0 || (b.add(c)).compareTo(a) <= 0 || (a.add(c)).compareTo(b) <= 0) {
                System.out.println("No");
            } else {
                System.out.println("Yes");
            }
        }
    }
}

